System of phase transformation.



PATENTED JUNE 9,1903. F. H. JBANNIN. v SYSTEM OF PHASE TRANSFORMATION.

APPLICATION FILED 0OT.20.1902.

NO MODEL.

lnvemCoT.

Frank H.Jeannin. WMDQW;

Witnesses.

AtfCv No. 730,828. I Patented June 9, 1903.

UNITED STATES PATENT OFFICE.

FRANK H. JEANNIN, OF SOI-IENEGTADY, NEW YORK, ASSIGNOR TO GENERALELECTRIC COMPANY, A CORPORATION OF NEW YORK.

SYSTEM OF PHAS E TRANSFORMATION.

SPECIFICATION forming part of Letters Patent N 0. 730,828, dated June 9,1903.

Application filed October 20, 1902. Serial No. 127,913. (No model.) I

To (bi/Z whom it may concern: Three-phase currents may be derived fromBeitknown thatLFRANK H.JEANNIN,aeitithese leads and utilized for anydesired purzen of the United States, residing at Schenecpose-such, forexample, as supplying motady, county of Schenectady, State of New tors,lights, or the like. 5 York, have invented certain new and useful Inorder to make somewhat clearer the na- Improvements in Systems of PhaseTransfortu re of the phase transformation taking place mation, of whichthe following is a specificain the apparatus thus described, referencetion. may be had to Fig. In this figure the tri- My present inventionrelates to a means angle, the sides of which are indicated at 12, 1ofortransforming an alternating current of a 13, and 14, represents therelative magnigiven number of phases into an alternating tudes and phaserelation of the voltages excurrent of a different number of phases andisting between the three mains 5, 6, and 7 of comprises various featuresof novelty, which the quarter-phase system. This relation is one I haveset forth with particularity in the commonin practice and in itselfpresents no 1 claims appended hereto. elements of novelty. The side 12of the tri- Forabetter understanding of myinvention angle represents thevoltage of one of the reference is to be had to the followingdegenerating-windings, as 15, of the quarterscription, which is to betaken in connection phase generator, and the other side, 13, the withthe accompanying drawings, in which voltage of the othergenerating-winding, 16. 7o 20 Figure 1 represents one embodiment of myThese windings are connected together at 17 invention; Fig. 2, amodification, and Fig. 3 and the junction point to the common return anexplanatory diagram. 5. The voltage between the common return Theparticular arrangements shown in the 5 and the main 6 thereforecorresponds to the drawings are suitable for transforming quarvoltage ofthe generating-coil 15, while the 25 ter-phase currents into three-phasecurrents voltage between the common return 5 and or vice versa; but itis to be understood that the other main 7 corresponds to theremainvarious features of my invention are not liming generating-coils16. The voltage between ited to use in this particular relation, but arethe two mains 6 and 7 is therefore the resultcapable of application inother relations as taut of the voltages represented in Fig. 3 by 0 well.the sides 12 and 13, and therefore corresponds In Fig. 1 a quarter-phasegenerator is repto the hypotenuse 14 of the triangle. resentedconventionally at 1 and has two of If a certain intermediate portion, soto its windings connected together, so that the speak, of the voltage 14be impressed upon a three terminals 2 3 4. extending from the genpair ofmains, then the voltages existing be- 3 5 erator constitute, with thedistribution systween these mains and the common return 5 of termconnected thereto, an interconnected the system above describedmay,within limits, three-wire quarter-phase system. The returnhe made tohave any phase angle desired. By conductor 5 extends from the terminal 4and taking the centrally-situated portion of this the other conductors 6and 7 from the remainvoltage lying between the points 18 19 equal 4o ingterminals 3 2 of the generator. A comto the two voltages represented bythe dotted pensator 8 or some other winding or device lines 20 and 21,extending from these points, giving rise to a counter electromotiveforce respectively, to the apex 22 of the triangle, a is connectedacross the two mains 6 7 of the symmetrical three-phase system ofvoltages quarter-phase system and has extending from may be derived.This, too, may be accom- 5 5 intermediate points therein two leads 9 andplished in practice ina variety of ways, one 10. The points ofconnection of the leads 9 of the simpler forms of which consists of theand 10 are so chosen that the voltage between compensator-winding S inFig. 1, having the these leads when associated with the voltages leads 910 extending therefrom,.as heretofore between each of these leads and athird lead described. The points of connection of these I00 50 11,extending from the common return 5, conleads are chosen symmetricallywith respect stitutes a system of three-phase voltages. to the windingand so that the voltage between the leads is equal to the voltagebetween each of the leads and the common return 5. With this arrangementitis evident that the voltages between the leads 9, 10, and 11correspond to the voltages indicated in Fig. 3 by the sides of theequilateral triangle, the angles of which are connected to the threedotted lines 23, corresponding to the three leads 9, 10, and 11 in Fig.1.

In Fig. 2 a somewhat different arrangement is shown for securing thesame general result as that performed by the arrangement represented inFig. 1. In this system a fourwire quarter-phase system represented bythe mains 24 25 26 27 is supplied with current from a quarter-phasegenerator 28 of any suitable type. Three transformers have theirprimaries 29, 30, and 31 connected, respectively, across the pairs ofmains 26 27, 26 25, and 25 27. The three secondaries 32, 33, and 34,corresponding, respectively, to these primaries, are connected in serieswith each other, so that their volt-ages are represented in phaserelation and as to relative magnitudes by the right-angled isoscelestriangle already described in connection with Fig. 3. A main 35 extendsfrom the junction between the secondaries 32 33, while two mains 36 and37 are connected to intermediate points in the secondary 34:, situatedso that the voltage between the points is equal to each of the voltagesbetween each point and the main 35, this relation of voltages beingrepresented by the small equilateral triangle in Fig. 3, one side ofwhich is contained between the points of connection 18 19 and the othertwo sides indicated by the numerals 20 and 21.

It will thus be evident that the mains or leads 35, 36, and 37constitute the conductors of a three-phase system by which energymay beconveyed to or derived from the quarterphase system already described,the transfer of energy being effected inductively instead of by a systemsuch as shown in Fig. 1, in which the three-phase system is electricallyconnected at certain points to the quarterphase system.

What I claim as new, and desire to secure by Letters Patent of theUnited States, is

1. In a phase-transformation system, the combination of three-phasemains, a winding having two points intermediate its ends connected totwo of said mains, and means for im pressing quarter-phase electromotiveforces between the third main and the ends of said winding.

2. In asystem of phase transformation, the combination of three windingsconnected in series with each other, three-phase mains connected, one tothe junction between two of the windings and the other two tointermediate points in the remaining winding, and a quarter-phase systeminductively related to said windings.

3. Inasystem of phase transformation, the combination of threedelta-connected windings, a quarter-phase alternating-current systeminductively related to said windings, a set of three-phasemains,connections between one of said mains and the junction between twoof said windings, and connections between the other three-phase mainsand points in the third winding other than the junction points betweensaid third winding and the other two.

In witness whereof I have hereunto set my hand this 18th day of October,1902.

FRANK H. J EANNIN.

Witnesses:

BENJAMIN B. HULL, HELEN ORFORD.

